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Seismic Properties of the Central Indian Shield

2000; Seismological Society of America; Volume: 90; Issue: 5 Linguagem: Inglês

10.1785/0119990039

1943-3573

Lin Zhou,

Seismic Imaging and Inversion Techniques

Research Article| October 01, 2000 Seismic Properties of the Central Indian Shield Limei Zhou; Limei Zhou Department of Geology University of Illinois at Urbana-Champaign Urbana, Illinois 61801 Search for other works by this author on: GSW Google Scholar Wang-Ping Chen; Wang-Ping Chen Department of Geology University of Illinois at Urbana-Champaign Urbana, Illinois 61801 *Also at Mid-America Earthquake Center. Search for other works by this author on: GSW Google Scholar Serdar Özalaybey Serdar Özalaybey Department of Geology University of Illinois at Urbana-Champaign Urbana, Illinois 61801 †Now at TÜBITAK-Marmara Research Center, Department of Earth Sciences, P.O. Box 21, 41470, Gebze-Kocaeli, Turkey. Search for other works by this author on: GSW Google Scholar Author and Article Information Limei Zhou Department of Geology University of Illinois at Urbana-Champaign Urbana, Illinois 61801 Wang-Ping Chen *Also at Mid-America Earthquake Center. Department of Geology University of Illinois at Urbana-Champaign Urbana, Illinois 61801 Serdar Özalaybey †Now at TÜBITAK-Marmara Research Center, Department of Earth Sciences, P.O. Box 21, 41470, Gebze-Kocaeli, Turkey. Department of Geology University of Illinois at Urbana-Champaign Urbana, Illinois 61801 Publisher: Seismological Society of America Received: 15 Apr 1999 First Online: 03 Mar 2017 Online ISSN: 1943-3573 Print ISSN: 0037-1106 Copyright © 2000 by the Seismological Society of America Bulletin of the Seismological Society of America (2000) 90 (5): 1295–1304. https://doi.org/10.1785/0119990039 Article history Received: 15 Apr 1999 First Online: 03 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Limei Zhou, Wang-Ping Chen, Serdar Özalaybey; Seismic Properties of the Central Indian Shield. Bulletin of the Seismological Society of America 2000;; 90 (5): 1295–1304. doi: https://doi.org/10.1785/0119990039 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyBulletin of the Seismological Society of America Search Advanced Search Abstract We use broadband seismic data at Hyderabad to investigate average crustal properties of the central Indian shield. Crustal receiver-functions (P to SV conversions) based on data of excellent quality and azimuthal coverage show essentially no signal on the transverse component, indicating laterally homogeneous structures near this station. A joint analysis of receiver-functions and the dispersion of fundamental mode Rayleigh waves result in a simple model for the shear wave speed (Vs) with a moderate gradient of 0.010–0.028 km/sec/km in the crust. The Moho is sharp, with a contrast of approximately 0.7 km/sec in Vs across a small thickness of only 0–4 km. Measured from the middle of the Moho region, the crust is 30–34 km thick, with an average Vs of 3.58 ± 0.10 km/sec. By modeling the timing and waveforms of Sp and SsPmp phases (SV to P conversions), we estimate the average crustal Poisson's ratio to be 0.26 ± 0.01. This value is comparable to that found in the Tanzanian craton which is also of Archean age, both values being somewhat lower than the global average of 0.29 ± 0.02 for shield regions that include both Proterozoic and Archean crust. A low Poisson's ratio and a slow Vs in the crust indicate that, on average, Archean crust beneath the central Indian shield is intermediate to felsic in composition, somewhat less mafic than globally averaged Precambrian crust. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.